:root {
    --bg-primary: #eef1fb;
    --card-bg: #ffffff;
    --accent: #6366f1;
    --accent-2: #ec4899;
    --accent-hover: #4f46e5;
    --accent-gradient: linear-gradient(135deg, var(--accent), var(--accent-2));
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 2px 6px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 12px 30px -8px rgba(79, 70, 229, 0.18);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background:
        radial-gradient(circle at 15% 0%, rgba(99, 102, 241, 0.10), transparent 45%),
        radial-gradient(circle at 100% 20%, rgba(236, 72, 153, 0.08), transparent 40%),
        var(--bg-primary);
    color: var(--text-main);
    padding: 30px 15px;
}

.app-container {
    max-width: 1050px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    padding: 34px;
    border: 1px solid var(--border);
}

h1 {
    font-size: 1.85rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 6px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

p.subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 25px;
}

p.counter-stat {
    display: inline-block;
    color: var(--accent-hover);
    background: rgba(99, 102, 241, 0.08);
    border-radius: 999px;
    padding: 4px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-top: -14px;
    margin-bottom: 25px;
}

.grid-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 30px;
}

@media (max-width: 850px) {
    .grid-layout {
        grid-template-columns: 1fr;
    }
}

.upload-dropzone {
    border: 2px dashed #c7d2fe;
    border-radius: 12px;
    padding: 44px 20px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s, transform 0.15s;
    background: #f8f9ff;
}

.upload-dropzone:hover {
    border-color: var(--accent);
    background: #f0f1ff;
    transform: translateY(-1px);
}

.upload-dropzone input {
    display: none;
}

.cropper-wrapper {
    width: 100%;
    min-height: 350px;
    background: #000;
    border-radius: 10px;
    overflow: hidden;
    display: none;
    box-shadow: var(--shadow-sm);
}

.cropper-wrapper img {
    max-width: 100%;
    display: block;
}

.cropper-toolbar {
    display: none;
    justify-content: flex-end;
    gap: 8px;
    margin-bottom: 8px;
}

.btn-clear,
.btn-zoom {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.15s, color 0.15s, transform 0.15s;
}

.btn-zoom {
    width: 30px;
    padding: 6px 0;
    text-align: center;
    font-size: 1rem;
    line-height: 1;
}

.btn-clear:hover,
.btn-zoom:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

.btn-zoom.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

/* Preview Grid Section */
.preview-section {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    display: none;
}

.preview-section h3 {
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 15px;
}

.preview-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: flex-end;
    background: #f4f6fd;
    padding: 20px;
    border-radius: 10px;
}

.preview-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.preview-card span {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

.preview-card canvas {
    background: #fff;
    border-radius: 3px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.15s, transform 0.15s;
}

.preview-canvas-wrap {
    position: relative;
}

.preview-canvas-wrap:hover canvas {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-download-preview {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 18px;
    height: 18px;
    line-height: 16px;
    padding: 0;
    font-size: 0.7rem;
    background: rgba(15, 23, 42, 0.6);
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.15s;
}

.btn-download-preview:hover {
    background: var(--accent);
}

.form-group {
    margin-bottom: 18px;
}

label {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

input[type="text"],
select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text-main);
    background: #fff;
    outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}

input[type="text"] {
    text-transform: uppercase;
}

input[type="text"]:focus,
select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.color-pickers,
.position-pickers {
    display: flex;
    gap: 15px;
}

.color-item {
    flex: 1;
}

.position-item {
    flex: 1;
}

.color-item input[type="color"] {
    width: 100%;
    height: 40px;
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    background: none;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 10px;
    font-size: 0.9rem;
}

.checkbox-group input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    cursor: pointer;
}

.range-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.range-item label {
    flex: 0 0 90px;
    margin-bottom: 0;
}

.range-item input[type="range"] {
    flex: 1;
    accent-color: var(--accent);
    cursor: pointer;
}

.range-item .range-value {
    flex: 0 0 34px;
    text-align: right;
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
    color: var(--text-muted);
}

.btn-submit {
    width: 100%;
    background: var(--accent-gradient);
    color: #fff;
    border: none;
    padding: 13px 18px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: transform 0.15s, box-shadow 0.15s, filter 0.15s;
    margin-top: 10px;
}

.btn-submit:hover {
    transform: translateY(-1px);
    filter: brightness(1.05);
}

.btn-submit:active {
    transform: translateY(0);
}

.btn-submit:disabled {
    background: #cbd5e1;
    box-shadow: none;
    cursor: not-allowed;
    transform: none;
    filter: none;
}

.app-footer {
    max-width: 1050px;
    margin: 18px auto 0;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.app-footer a {
    color: var(--accent-hover);
    font-weight: 600;
    text-decoration: none;
}

.app-footer a:hover {
    text-decoration: underline;
}